| Term | Definition |
|---|
| segment | part of a line that has two endpoints |
| ray | part of a line that has one intial point and goes endlessly in one direction |
| opposite rays | if C lies between A and B then CA and CB are opposite rays |
| collinear | points, segments, or rays that lie on the same line |
| angle | two rays that have the same initial point |
| acute angle | less than 90 degrees |
| right angle | exactly 90 degrees |
| obtuse angle | more than 90 degrees but less than 180 degrees |
| straight angle | 180 degrees |
| adjacent angles | two angles that have a common endpoint, a common side, and no common interior points |
| Ruler Postulate | The points on a line can be matched one-to-one with the set of real numbers. The distance, AB, between any two points A and B, on a line is equal to the absolute value of the difference between the coordinates of A and B. |
| Segment Addition Postulate | If B is between points A and C, and AB+BC=AC |
| Angle Addition Postulate | If C is in the interior of angle AOD then the measure of angle AOC + the measure of angle COD = the measure of angle AOD |
| conditional statement | a statement that can be written in the "if-then" form |
| converse | statement formed by switching the if and then parts |
| Postulate 5 | Through any two points there is exactly one line |
| Postulate 6 | A line contains at least two points |
| Postulate 7 | Through any three noncollinear points there is exactly one plane |
| Postulate 8 | A plane contains at least three noncollinear points |
| Postulate 9 | If two distinct points lie on a plane, then the line containing them lies in the same plane |
| Postulate 10 | If two distinct planes intersect then their intersection is a line |
Combine with other sets
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